Troubleshooting; Procedure - Denso HP3 Service Manual

5. Troubleshooting

5.1 Procedure

Symptom
(No: Check priority)
1 1 1
Pump
assembly
2
2
SCV
6 6
Pump fil-
ter
4
4 5
Regulat-
ing valve
1 3
Feed
5 4
pump
Element
3
3
Pump
2
housing
Cam ring
NOTE:
If there is fuel leaking from the oil seal, visually check the oil seal and shaft shoulder for
wear. (See the boundary sample.)
Check method
Check for fuel leaks to the
1 1 1
outside.
Measure the resistance
between the SCV termi-
nals.
2
2 2
Remove the SCV and
check.
6
Remove the filter and
check.
5 4 Individual check unneces-
sary.
4
(Revised Sept. 2005)
Remove the feed pump
4
and check.
Remove the element and
check.
3 Pump the plunger.
Check inside the housing.
3 3
7
Remove and check.
Judgment criterion
Leak (See note below.)
Does not meet the standard. (See the standard in the
investigation standards table.)
Foreign matter caught in valve port
The terminal is abnormally worn or scorched.
(Visual check: See the boundary sample.)
The O ring is cut.
The O ring is cut.
Foreign matter clog
The filter is broken.
In the case of a malfunction, replace with a new part.
(Revised Sept. 2005)
The rotor is abnormally worn.
(Visual check: See the boundary sample.)
The cover and plate are abnormally worn.
(Visual check: See the boundary sample.)
The key is abnormally worn.
(Visual check: See the boundary sample.)
The plunger slide surface is scorched.
(Visual check: See the boundary sample.)
The cylinder is cracked.
(Visual check: See the boundary sample.)
The Plunger SP breakage
(Visual check: See the boundary sample.)
The plunger is loose and does not return.
The overflow port is clogged with foreign matter.
The cam chamber orifice is clogged with foreign mat-
ter.
The zero orifice is clogged with foreign matter.
The bushing is abnormally worn or scorched.
(Visual check: See the boundary sample.)
The plunger slide surface is abnormally worn or
scorched. (Visual check: See the boundary sample.)
39
Solution
Replace the leak section.
Replace the SCV.
Replace the SCV.
Replace the SCV.
Replace the O ring.
Replace the O ring.
Clean or replace.
Replace the filter.
Replace.
Replace.
Replace.
Replace.
Replace the element kit.
Replace the element kit.
Replace.
Replace the element kit.
Replace the O ring.
Replace the O ring.
Replace the O ring.
Replace. (Replace the
partner part too.)
Replace. (Replace the
partner part too.)